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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6ddd09ed9359cf63ac76db1b5554dedfbb0218d13ac8f8e494deb3b8f7ea4e' 
  AND token = 'aRF6rilnRloNRcok6ipVwNsgb3DJDtruz1UvSV9aa38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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