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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63bbe9eaa601f15d95a32f3bc36499ccd0b9e4c546a3adc44fb09168d658caf' 
  AND token = 'YwtmgxowX3tUjC/jCKQ0cihngZiA9RT5QicipxTeQrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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