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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cb486de41388c4cf5343b0e99810ad4a2e1740cdb4623dd4b0e72e7b3661eb' 
  AND token = 'LF4N34GNyh3MBDIXN/a1tiIRn27HB4cDPJLwh+Rukkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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