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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fb63ea576e10b6f162558e4e57565c0b8ad46e2d2606efe2cd040d73d5ec00' 
  AND token = 'DoMN4G9QYqsdKew35L8EWh0eyJa1P41g3KjJ7KHHn8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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