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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac81dad31593189306a81107564f60e93e1b9697fa08b4881d380c4eb5bdcb7b' 
  AND token = 'aCuzXnoyJxPeoEDTiH6Nm7OrHkPUS0lsN10PmHg960A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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