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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe39a64f0cca0c93962d20005b498f40f4198ac0f4efdc512ed305568bc78a1' 
  AND token = 'TOOcDcvkBpqXD2KF/rkeKLVR9ZQWWAwW6K6dxbzraoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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