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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7776b6434c4783ad834aa6ecceebd8f62c3490dca52223bd0cb0b72b564789a' 
  AND token = 'EkRDDofndpHw3TjfdG/ERVOqprNk33hYP5mIeNv2GEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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