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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd06f510cc8387280ea354c221c8a8faf8449e5b6b87129888ec60ddb614493d' 
  AND token = 'EM3srt8MQg7yRB+ft/xjtk0TI0y4kTK++xwdA53tVCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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