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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae77534274285e516175d10e04db57e52793defc281259716497cf187d833198' 
  AND token = 'bHEecjDrDLznP4feY1aHSAS2GiicndR+Ow6fAl7F3T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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