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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9357dd6b4f6f74b6a131ec6d7978027340fc37843d3c79ebe33046be32e14aa' 
  AND token = 'nxHyFf7gwyAjckX8wzZS8B0jGbBo+WytKI3ovKXi6Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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