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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637847895589dac4cf1b1cd24968a71a24bbf489ec8f69313de717c68b603afb' 
  AND token = 'NilXj5s7x/emzSmDuusciLDS7TH1eBJwc9EHOHYe+tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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