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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038699e295ec9e22c825580f70002af90b1158fdf66d6d1646e9bcb5d9c46b22' 
  AND token = '8yphEtEx0dYh60DkbPhfDPQEM/3zLVdx9km5zrbfCFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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