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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4e529f87e3504cc29b5b3bee416ca8b335f2445f526ab629d258b17423acc5' 
  AND token = 'DiqKq2z98kuZJb25Zeu1Jmq5/m1Ps8WJY3oGXpLCf3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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