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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41598cb702a5eaf61730e0422f723f79520f4d06559c886245825bd24b8feea' 
  AND token = 'jqDi4XPLSY122mIj3oplvl5nJ3ot4m+2PnQZKZtDPFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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