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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23347b36010915c996d525b54bf63d9f05dc9da692f37192aa4289d56ccf0433' 
  AND token = '8Jxf18/dVOaImQlk8okuwQpbzrY52vikJkOwzPi6sic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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