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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99c04da57ca9bb4c67ef285c4c899f287ab77e42bfd8e25f0e467131ec81a1c' 
  AND token = '7pS0TG6brHEswX6L2HQeB2elB21OE1Zo6KTasFBadQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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