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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f54706c00a32926d3c9544dfddfe0f759b805d938334b46d00a6ed411b8a17' 
  AND token = 'hXRtcXiUjGys9qvkc2LlcBvqxqZpBdBikV4DO7l0OjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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