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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f582a31abb7c2eb77a7b1342e350d7d3caf20b82e05dd75995d55d2f7a8a9f13' 
  AND token = 'uN4928SueDdEDDVCH3oGb9OFykcpM04RQT3SrS0XcZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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