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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c802f1a1dac904a1e92c09e67ba55da6909cb33c142d52e047811e38330d662' 
  AND token = '7ng6HkAnMeqIG5zhQs+nQHY/X/8cb+q6d33gqIru8D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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