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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2311d200f865354fb0f1aa1a17d9c409e2988ec32e3eebfe746621cf1ca226b3' 
  AND token = 'jX262eZvfR+bItXzcHEtLEj/+T4gVHleQ5molUttbA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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