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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e3342dc9b38e2317a4d300d0c788fa951eddef1304c8dfb4617ea58b15630e' 
  AND token = 'BSst37GMIubD89d5b3/t9Mswivj+mTM55Y86UM+ZcPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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