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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bdc901ff168f43bdf8bbd60f8ef0643cfd50a341ad8c4c08cf28412a0dd4ea' 
  AND token = 'OndhUeqsqMH36ljsJHMqfWUlNOAta/i/6e5mLqcdfrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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