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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794dbc3d1f965724fbccff7d5978c2c3327548cd124aeca09de56bf8a3231208' 
  AND token = '83EVtBownKJxaYmxXXl0xrHstexKUgifRfodmk9aapE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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