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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbcdd2eac8b840538b956d4a8fd5b1d48fe09d2cba5d4725b66d32e7e4865e8' 
  AND token = '5djLyI8kTJRu3xpDPQJctFns4U2XUUyfjXisVcaIukE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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