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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d3a08dc556c2daf0f55bf66cc844c90af7e4e2ab27b02786d7be5ec76ec61c' 
  AND token = 'xuP3PBxxmZX8VPbinlKtGIaNbRF9ym1d1XFAPOXm+Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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