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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91475e7f8cadda893f7b8b9e0c7c7fcb2dad23b7808af109723b8ee334f39600' 
  AND token = 'GTyfCcf68TniwKZrRS0H44l53pZKSrskNksA07skFjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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