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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d4bb30e941f4db174872230a70acddab22fc8b9a6482a0500208e0f11ddffd' 
  AND token = 'NmvsHFlq+5voYotfg9ybu+avA2x6U/Gfn8+N7QRDuYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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