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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8318a7ac2456da00b7b0ebb7a219ef5cc5cd7cee0ef6328266f3406d199e9e42' 
  AND token = 'G8ebjz73s1o7N2wD/OJfwvcN509nf1IUFGONUBAYc5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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