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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f70bc4ead92d2de5b617a0d0bbcbae6b5d34264650a7a1fdec953e2cc37c842' 
  AND token = '7Fob1nXroZmr6W/aQTk+YhVVvvwx5j+f2LullnMuSJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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