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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c42a01ae2da2f9d8ba3f4075930863ae5fdc9e801bc15ecfcab43be9ac399be' 
  AND token = 'ODiNbrHdRuqCy/AXbnUwy4pQod2w3UbYX4R5TVddk+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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