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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e04d04133d2d2ec9ef8eeb30f28e52c4882d560cc8831572ddf8ad27adc06c' 
  AND token = '+6uD6lyCTZwBgt5QhQjx9RNCnHUqX5PuX2zwyxZna7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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