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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1c7c12479b5dc3565f0f34d8e5db28e7f807f6c8ce899dea4ad5ac021e2174' 
  AND token = 'jbAWEblQXXRqcmVu5TLd4kan966lludS3ZM/ft3+Yg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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