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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25c5716e6ce36aac1dcccfc9203f0d62e6302238b28e25a8a393d3bde8315dd' 
  AND token = 'V8pQ6HwrME1uC57Hbj1ZwpebVVZBFhOazv9I2NYozuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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