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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a29629659e791fb8bdfc445f2a301742d550e4837c61d719e7fa05c1f98d9d' 
  AND token = '8rJvB0xzi7vG5S+J96KBrbsx3gJMMbkyMOmDxH6qp1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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