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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fba5685a944cd24ea40c4db7d2ca81de396d5ba9a531d3b0fec2e40e3b4bf43' 
  AND token = 'haHhQbPpNeaRzkNyqRdM06uYDRRvEbt1RkVmORkIh6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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