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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6ba6a578538970f5554e8750f1bb344f68bba93f7a60a81a85b69aeaa846ac' 
  AND token = 'FxvhltUdNY0BHufnXnG8y0qw8cNbJGj8Cn3Sfmhn4Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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