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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7329c478d61e4b24f4db87bb480ac6d18f8d371455c731d6845bc888578e2e' 
  AND token = 'yt0Mo+3Zm6EmvJCM9eYf0iAHAOBFzzBkwE+P5do8E1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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