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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0635b8eb98e8d18c168eba8a13247760a95349b1f5a005c886084005696db2ea' 
  AND token = '3mi+10LgdS5A4S2oakF3eTh2ivcp7zhdFxShYZOBKGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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