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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1988790ffafaec4e6b1bf994fcd492b7c85ed3b4907f36a720a616b1914a5438' 
  AND token = '7Kj5THAiNRAyGeFoT+MxHA3YKgxdUNZ1GepKtkSOW2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}