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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d471e4101852b12fb851334f7f56bfc3da887e44122d5ec470727cb95ce64f' 
  AND token = 'ULncJ5xiJ+jI8IGt/LWwyuJe26OHpSd+WBLHjpQaFk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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