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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62958addda8e3df3f5e0dd40f87e48fd7cbf64593bce34bea05b82871c0ba2f8' 
  AND token = 'QmBBlYYS675bjfZeAHHSPz25FNMy0ABv8cqmS2mMUPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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