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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce922da7331cba1dae28f28ec8fe29573f18e99c9c06071d3e24d676a43f04bf' 
  AND token = 'PCCr4n8QzlytVdt7IPpryyPyEMnAQUSf02ZIdmXvp5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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