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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa6cf4a0affbfcaf29c0fdc0e420b1c1a327fa77e70df6ef700bf982beef88b' 
  AND token = '9TyVrluG5EtXuya3qfN9LSo0XfMXQHSL+6t+dX5Y1MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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