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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd24df0e5635c1e6f7d21b7d531650bd58f33559bccfd9d5dce26c3567998d9' 
  AND token = '/Em1HVRla7j6uMzKOz/3cA9Q9fAUQC9YWZVV0/OsGKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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