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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3413786051cb775b9296de3dad4fb1b9885bdb72e6005929145f802ca27b11bf' 
  AND token = 'rDHTQtA0UOjttVcSIAiu+5JDJqmu9HTI+k3Duq+TnQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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