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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4b0610625c200ff48b4286cef7a2ab9a167b78e05ddd0e6eb69973be30eadb' 
  AND token = 'L5Ur/kn8mrxl/aomcFxdNbA6nTJSSFikdqbFd9sjCrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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