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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d6d3bf579cd4abb3c487fa8de54ac12293bc2ae6c97354b54f032b8fa19412' 
  AND token = 'oLWC+4O93N+Nc775xc9JoNDINCj6ryPhTTQkQ/I1AW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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