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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1ab5a1b6859938f529f3ba8ce71ee58ec5de390a46f13ce0889974b95fcafd' 
  AND token = 'NJhptTH0kQBoW1gnaw2QjqjX0CjyD2o+BAOXNk6krmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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