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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564636aaa94bc992c874fc972a7e9765ad67f26613dccc2ff2d782674bab683e' 
  AND token = 'BxVYdWgWUHP5v/MAn2xMbO4VqLm2hq81P4kXH5hiIqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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