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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6443c13059c27c48d6542a9a45d35dbd3a5e3aa445fb1c64b17ec86b0fa2f100' 
  AND token = '4gsVY5lzQPNcETPEv5YSq7AJKT2FWQlL0j1fdyqrmpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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