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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394694e0db4ba7a992dfa7d6f753caae88e4134f37bf9f6dccc60e2c10c0f93c' 
  AND token = 'fKydLqrL2cn6fdkLQz1vV2QXr5ymD0t2tT9jmN4vNwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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