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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d3e3c1de808bb822051b50dca60e7abe64204908b9085a4cd04ad36d61743a' 
  AND token = 'FiRVr7J9uFKuMmoRKQU9CHWxRp0Drrp4vIcJzAsCJLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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