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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e90a31c2c8f81f2aff19d072870d67145c6bea24247c2393f059f34d2e3bbe' 
  AND token = '3PkiCPCwbX5kGZhJLgUEsAb78R7nfGQAJp3tgAc0RZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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