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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69c8536563085144ff9350f0043d3b43c9d705eff4451678e305c1b2d3775be' 
  AND token = 'jr09I7J6nmLvBDzQIpwmO1b4BhdVakPyCgYFivYNvN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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