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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e88814d3ce9a1783a74d6a06b60e8876c72f86a4664b6f8386c85f99c138ddc' 
  AND token = 'sKE3J1kRCfu3DZ3+nNFmrKY4L0D+cFB6daM4vTcNZ+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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