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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc46152e04c2d1c542b87c088dfef12b43e2041b2a158ef783082591043247a0' 
  AND token = 'TDb4GmfxVAdtTnguzzxdObcbagRESZobPNq1sFVS67c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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