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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0812a80e96d0748507df471c78590755820495327ca3c5ed6bce0508f588d3a4' 
  AND token = '1pGQPaNQx/6PKxJ6cXi1lQ1dGqirxrQacmeehdF2i44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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