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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a537397614bc05c454f6d7d366d444a49d55d0a0c68295f39ab8eed2370d35' 
  AND token = 'J5oq3YxyQY8WCtgHSZNUEIvU+AoTH3vLUATcxwnfTF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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