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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324e54578d4541a08d456e10cd477a9a5b7851b0763ce3a798a191e9f783b414' 
  AND token = 'euBLGCabTQv3+5e/xB8ACUwD9S43q5qDga6CiYpOM3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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