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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7761148379a28c1fd269ffb0cf2640e170e40cfb302fc17c6cf4f2a23d7e24' 
  AND token = 'FGlH4thyeggpvF1CTBoPIoUohIhes/dHWnTFYTPgdWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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