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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46ce79778969953eb707ae51151cbf2b030b2975f29f3eaaa8f4bd706099f4a' 
  AND token = '7HbmP4LSgIzzskHeJXOMa6y+n0R0kY3TmgDrwk1y5tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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