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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801da1cc35079cbab47c35e27918b85e3a547e5c72b7b8b46edbd7bcf9202f11' 
  AND token = 'i8IK/hvYaC2g9izAXu8NmHzPCO+kQigshnOsknGb8jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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