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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23f83b0bbc665213da938e11a0ead64a106a73c7c9ed3da34c907148be1d5ee' 
  AND token = 'RDqJafU9nHvzF4k+f+yifw/t0xD1Rm1yMwtAP3GkrpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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