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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a0b6ecfe63fe189d1bb5660bbe95282f367f933a7c232d54a39f539a975d65' 
  AND token = 'j5t0jJ8tRlQoCe7lMPxpRUHr8CcZwgS+sk/Ro52Eurs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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