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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bade4785f0ceb406278cd8f22561c0a668ccc36c95c84e9c5c8ebf7ca94b21' 
  AND token = 'EUo5674wpZb/R359IQ03MDpYpuS82QSSi9H9TVuJM2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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