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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b14c5abc9bc68c0cea36b3fc0851fc766befb3f2027305279660fb7db1ab25f' 
  AND token = 'kH86LNk2NgLRSH0MUOGSXPRp6xaxuzpom8Kx4FmkDno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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